A Localized Late-Time Interaction in the Dark Sector

Key Points

• The aim is to explore an interaction between cold dark matter and dark energy during the late universe phase.
• Develop a phenomenological cosmological model with late-time interactions.
• Utilize a sensor-like function that peaks at redshift z≈0.5.
• Analyze compatibility with BAO and supernova constraints for interaction strengths up to x≤0.2.
• The model remains consistent with BAO and supernova data for x≤0.2.
• Demonstrates a mild suppression of late-time structure growth.
• Suggests alleviation of the S8 tension in cosmological observations.